Strap-on male prosthesis



FIG. 1 is a perspective view of a strap-on male prosthesis, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a front elevation view thereof. 

The ornamental design for a strap-on male prosthesis, as shown and described. 